With New Arrest, A Strange Turn

Matthew Teague: TUPELO, Miss. — Federal agents of all sorts invaded northeast Mississippi several days ago, on a mission: Find the man who sent a poison-laced letter to the president. But the United States government quickly found itself entangled, once again, in a misunderstood land dominated by squabbling tribes and petty vengeances.

Agents first arrested an Elvis impersonator, released him, then on Saturday arrested his nemesis, a karate instructor. Gradually investigators concluded that what they had descended upon was probably less about the president — or the U.S. senator and retired state judge who also received letters — than a serious case of indigenous bickering.

That shocks no one h…